DE1154410B - Procedure for carrying out a vaginal saturation of sugar juices - Google Patents

Description

Method for carrying out a saturation of sugar juices The cleaning of sugar juices is mainly done by treating them with lime and Carbonic acid. Lots of variations on how to carry out this process with these two Substances were developed to contain as many non-sugars as possible in one simple way To remove away from the juice and at the same time the precipitating non-sugar substances to bring them into a state that allows good mechanical separation of these substances z. B. by settlers, rotary filters, centrifugal separators and others. enables.

The developments in this area were primarily based on the knowledge that during the formation of a calcium carbonate crystal its surfaces a have particularly strong adsorption activity and are based on the exploitation of this knowledge this process even during the pII-dependent flocculation of non-sugar substances to expire. The well-known withdrawal of saturation sludge is particularly effective here cheap.

According to a known method, the preliminary decision should be carried out simultaneously Lime and carbon dioxide in sections and with intermediate stabilization breaks can be added to progressively increase the pI from 7 to about 11. The juice from the stages with a higher lime or carbonate concentration should also be used can be partially recycled in steps of lower concentration.

After a similar preliminary decision, the sugar juice is first subjected to a lime-carbonic acid treatment, the pl, -characteristic of a corresponds to multi-stage progressive preliminary decision up to the end point of about 10.8, after which the juice treated in this way is clarified and a second lime-carbonic acid treatment is subjected to a pI value of about 9.2, the point of optimal alkalinity. The separated sludge from the juice of the second treatment stage is then intended as Concentrate pure carbonate in the first stage corresponding to its pH value Treatment stage are returned.

During these known procedures with a pre-separation of the juice work. Another known method is the addition of the entire amount of lime provided in partial amounts with simultaneous addition of carbonic acid and the juice one after the other exposed to a number of distinct pH levels, up to the last one Stage the final pll value of about 11 is reached. The transition from a pll stage on the other hand happens by leaps and bounds, even if according to an older suggestion part of the sludge juice obtained in the last or penultimate stage added to the venison juice or an earlier stage of the process.

The method according to the invention makes use of a partition saturation of sugar juices by simultaneously introducing lime and carbon dioxide in partial quantities in the form of progressive vaginal saturation with partial withdrawal of the juice and is that the entire amount of raw juice without prior pre-separation on the Paths of progressive vaginal saturation in each p "level up to pf, value 11, respectively one or more times for recirculation with simultaneous supply of lime and Carbon dioxide is brought into the returned juice streams.

The main advantage of such an unconditional divorce saturation can be seen in the fact that in each of the returned juice streams due to the addition from lime and carbonic acid, new calcium carbonate crystals are constantly formed and during their formation are fed to the main flow of the juice to be treated. In order to are the sedimentation properties of non-sugars and their filtration coefficients much improved. without increasing the consumption of lime.

The flocculation can then be easily separated from the juice and the juice can then be put into the second saturation, in which the carbonic acid is up is initiated for optimal precipitation of the calcium. Before that, the juice can still to further destroy inverted sugar and amide saponification for a short time higher alkaline and heated. A major simplification of the facility to carry out the procedure arises if after further training of the process, the separation saturation when returning the juice stream in each case is carried out in a pipe using the mammoth pump effect.

It is also possible to use the same procedure for the second saturation to apply, in which the juice freed from the colloidal flocculants is the first Saturation with or without post-limescale until optimal calcium precipitation is achieved will. The simultaneous addition of milk of lime is no longer necessary here, however, adding a small amount of lime proves to be advantageous for certain juices. The most important advance in the recirculating second surge is also here the steady and intensive return of the carbonate crystals that have already formed against the general direction of flow of the juice.

The drawings show schematic examples of an apparatus for to practice the method of the present invention.

Fig.l shows a longitudinal and cross section of the device, Fig. 2 a Flow chart for Fig. 1 and Fig. 3 shows a second embodiment of the device in the top view and in longitudinal section.

According to Fig. 1, the device consists of one depending on the power of the system measured number of chambers connected in series in the juice flow 1 to 6. From the chambers 2 to 6 there are two adjacent chambers by overflows connected to each other, arranged in a cascade to maintain the flow of sap are. At the bottom of chambers 2 to 6 in the shape of a funnel there is a U-shaped tube 7 connected, the rising part of which is above the liquid level of the opens into the previous chamber in the juice flow, while from the funnel-shaped bottom the chamber 1 a pipe 7a is led to the chamber 2. In the ascending part each Tube 7 is an inlet port a for the carbon dioxide and in the descending part of the tube 7 an inlet nozzle b for milk of lime is provided. That from the chamber 1 pipe 7a leading to chamber 2 has no inlets for lime and carbon dioxide. the Chamber 1 has an inlet nozzle c for the juice to be treated and the Chamber 6 has an outlet nozzle d for the treated juice.

The place of introduction of the milk of lime can be varied. if If a finer carbonate crystal is desired, it can be added shortly before the carbonic acid occurs or for the production of a coarser crystal at a corresponding distance behind the entry of the carbonic acid. With a conventional dosing device, both the total amount of lime as well as the proportion for the individual stages of this total amount measured. The addition of milk of lime can - depending on the quality of the juice - at one level or in the case of several, especially in the first stages, can also be omitted.

From the flow chart according to Fig. 2 it can be seen that the at c in the raw juice entering the chamber 1 with that returned from the chamber 2 via the pipe 7 Partial flow of the chamber 2 meets. The two mingling with each other Juices are pressed through the tube 7a into the chamber 2, where they are with the from the Chamber 3 meet through the associated pipe 7 returned juice.

In each tube 7 takes place through the supply of lime and carbonic acid the actual separation saturation takes place, whereby the carbonic acid the partial neutralization the milk of lime causes. Furthermore, the carbonic acid works on the principle of the mammoth pump the return of the partial juice flow into the adjacent higher chamber. Around to keep the recirculation of the juice constant with varied amounts of carbonic acid can, if the amount of carbon dioxide is reduced, via an appropriate facility Air or saturation exhaust e.g. B. be added at e. This admixing can can also be done separately for the individual vessels.

The final pH value and the entire pH curve can be regulated by appropriate dosage of the milk of lime as well as by shifting the ratio of carbonic acid to air. For the vessels 1 to 6 provided in Fig. 2 z. B. the following pH values are possible: 7.2, 8.2, 8.8, 9.6, 10.2, 11.0. In order to achieve optimal effects, however, the p11 curve should be adapted to the corresponding properties of the respective juices. This adaptation can be carried out extremely easily with the described device in a wide range of variations.

Fig. 3 shows that vaginal saturation and recirculation do not only needs to be done via an external riser pipe. Here are two rows of z. B. six chambers 1 to 12 side by side. The actual flow of juice goes on again cascade over chambers 1-2-3-5-7-9-11. Takes place in chambers 4-6-8-10-12 the introduction of carbonic acid at a and milk of lime at b. Doing so again with the introduction of carbonic acid or the carbonic acid-air mixture or carbonic acid-saturation exhaust gas mixture causes the juice to be returned to chambers 1-3-5-7-9. With appropriate Arrows indicate where the juice flow is at / under and at g over the respective Partition wall flows.

When using the device for the second saturation, the Number of chambers must be less than at the first saturation.

With the method and apparatus of the present invention the following beneficial effects for juice purification are achieved.

The well-known effect of adsorption between the calcium carbonate crystals im statu nascendi and the colloids will flocculate throughout the whole Increased use of the juice path between pH 6.2 and 11.0, at the most favorable in each case pH value, so that with the crystals and flocculation by further adsorption and further growing mud particles can be obtained in a convenient size.

The sludge juice is returned automatically. The usual withdrawal Larger amounts of sludge juice or thick sludge are no longer required.

By returning the juice to a level with a low pfi value the so-called obersaturation effect, the one exerts a beneficial influence on the flocculation of the returned juice. Apparently, the aging and shrinking colloids also promote it after returning to the previous stage, the flocculation of the colloids present here in a particularly favorable way. Locations of over-calcifications, which the Treatment of the koiloids in an undesirable way is largely avoided. There is a gradual increase and, in terms of effect, optimal rotting the p "values.

The seeds, e; 4 ^ erlen completely and evenly when reading through !: ' Jarch shuffles the device. with the atisiic.ckungen and crystals through the Saturaiions # -, # @ c: treated gently as a means of transport ;; ground ira opposite for the use of mechanical clocks or pumps.

As required, finer or coarser crystals can be er: @ eu @@ t.

If the inlet connections for milk of lime and Saturationsga @ are close together are arranged, aiicli is a sheath saturation at low p "values, ks sugar juice possible.

If the procedure is used on the second saturation, work the returned kris @ all as excitation crystals and ensure a further cancellation the supersaturation of calcium carbonate and for coarse-grained crystals. This will the work of the second saturation also with regard to the most extensive possible Improved descaling.

The device for carrying out the process is simple and reliable, because it contains no moving parts.

Since the U-tubes below the chambers can be extended as required, the height of the juice level in the riser can be adjusted accordingly. The U-tubes can be retrofitted to already existing preliminary decisions of a known design in a simple way Way to be grown.

Claims (1)

PATENT CLAIMS: 1. Process for carrying out a separation saturation of sugar,: rsjuices by simultaneous introduction of lime and carbonic acid with partial withdrawal of the juice, characterized in that the entire amount of raw juice without prior Vorscheiduna on the way of progressive separation saturation in each p at p "value 11 is brought one or more times to recirculation with simultaneous supply of lime and carbonic acid in the returned juice streams. Process according to Claim 1, characterized in that the separating saturation during the return of the juice streams is in each case in a pipe using the mammoth pump effect 3. The method according to claim 1 or 2, characterized by the application to the second saturation. Documents considered: German Auslegeschrift No. 1 013 590: German Patent Steps No. 939 680. 921 9Si). 893 - +; ' 3. Older patents considered: German Patent No. 1 043 979.